gcc/testsuite/gcc.dg/debug/dwarf2/dwarf-merge.c - gcc - Git at Google

 /* Verify that mergeable strings are used in the CU DIE.  */
 /* { dg-do compile } */
 /* { dg-require-effective-target string_merging } */
 /* { dg-options "-O2 -gdwarf -dA" } */
 /* { dg-final { scan-assembler "DW_AT_producer: \"GNU C" } } */
 /* { dg-final { scan-assembler-not "GNU C\[^\\n\\r\]*DW_AT_producer" } } */

 void func (void)
 {
 }
	/* Verify that mergeable strings are used in the CU DIE. */
	/* { dg-do compile } */
	/* { dg-require-effective-target string_merging } */
	/* { dg-options "-O2 -gdwarf -dA" } */
	/* { dg-final { scan-assembler "DW_AT_producer: \"GNU C" } } */
	/* { dg-final { scan-assembler-not "GNU C\[^\\n\\r\]DW_AT_producer" } } /

	void func (void)
	{
	}